'property': is not a valid property for attribute 'attribute'
A invalid or unrecognized property (or parameter) was passed to an attribute. Check the documentation for the attribute.
The following sample generates C3322:
// x is not a property of the idl_module attribute: [idl_module(name="MyModule", x="My.dll", uuid="..."), helpstring("Not a rectangle, a square"), entry(1)] double square([in] double x); void main() { }